一、褐皮病的扩展刨去干枯的外皮露出带褐皮的变色区,借以测定胶树褐皮病的发展程度。证实了1974年年报中提到的褐皮病沿着乳管扩展而引起的许多特征。但有一个特征未报道过,即开割第一割面的胶树,褐皮病是在下刀处的上方向外扩展,而不是在收刀处的上方向外扩展。这一特有的扩展方式在许多胶树中都能看到。可能是众所周知的乳管垂直排列 First, the expansion of brown flake Plane to dry the skin exposed with brown skin discoloration area, in order to determine the degree of development of gum tree brown disease. Confirms many of the features that have been associated with the expansion of the flagellosis along the ducts mentioned in the 1974 annual report. However, there is a feature that has not been reported in the case of the gum tree that cuts the first cut surface, and the flaky skin disease expands outwardly above the lower knife, rather than outwardly above the knife. This unique extension can be seen in many gum trees. May be the well-known vertical arrangement of ducts